Month: January 2018

The Red Pitaya should not be able to receive signals on the 70 MHz band. The user manual states a range of DC-62.5 MHz. That being said, I decided to ignore the manual and perform some tests using WSPR to…

The historical records held by WSPRnet are a valuable resource for analysis and data-mining, however the file sizes and number of records make data manipulation difficult and time-consuming. Last year, I noticed a post by I2GPG – WSPR Log file…

Using Airscout, it is possible to evaluate the possibility of Aircraft Scatter (AS) assisting with several hypothetical contacts. If there are aircraft in the pink area of the lower graph, then an AS assisted contact could be possible. Three active…

After the brief excitement of a small winter Sporadic-E opening last week, all has been predictably quiet on the newly installed 6m antenna. When trying to dial in the correct frequency offset for receiving WSPR I noticed Aircraft Scatter on…

The Red Pitaya can function on the 50 MHz (6m) band. As the remote site is at relatively high elevation of approximately 200 metres ASL the decision was made to install a 6m antenna. After some research, and reading the…

After comparing the KiwiSDR’s audio with an SDR from a different platform, I decided to look into the filter settings of the KiwiSDR. The default settings on USB (and LSB) are a receive bandwidth of 2400 Hz, with a low…

Propagation on the low bands has been good in recent weeks. While it is now not unusual for WSPR to be heard from across the Atlantic most nights in the winter season, the digital conversational modes such as JT9 or…

Ethernet switches, routers and cables are a known potential source of interference to reception. The effect was visible using the KiwiSDR on the 20 metre band with spikes every 60 kHz. To mitigate this interference source, the switch was changed…